Analogue and digital signals-P6

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  • Created by: kira
  • Created on: 19-06-11 12:33

(notes taken from the CGP revision guides)

  • Analogue signals vary but digital's either on or off.
  • The amplitude or frequency of an analgue signal vary continuously.
  • An analogue signal can take any value in a particular range.
  • Dimmer switches, thermometers, speedometers and old-fashioned watches are all analogue devices.
  • Digital signals can only take two values - they're made up of 'pulses'.
  • A digital receiver will decode these pulses to get a copy of the orignal signal.
  • On/off switches and the displays on digital clocks and meters are all digital devices.
  • Signals have to be amplified.
  • Both digital and analogue signals weaken as they travel, so they may nee to…

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